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Finding the Fourth Proportional to 939, 1,406.67 and 691.75

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Solution

The fourth proportional to 939, 1,406.67 and 691.75 is: 1,036.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    939 : 1,406.67 = 691.75 : x
  2. Step 2: Convert to fraction form
    939/1,406.67 = 691.75/x
  3. Step 3: Cross multiply
    939x = 1,406.67 × 691.75
  4. Step 4: Simplify right side
    939x = 973,063.97
  5. Step 5: Solve for x
    x = 973,063.97/939
  6. Step 6: Final answer
    x = 1,036.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.